Devonian Floras; a Study of the Origin of Cormophyta
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20, 3) of which there is no evidence that they were formed in tetrads, or that they were heterosporous. These discs never overlap, though they coalesce occasionally. A grooved lamina (Fig. 20, 2) occurs on one side of the thaUus and is probably ventral.
In general habit Don and Hickling compare Parka with the Fig. 20. Parka decipiens, Flem., from the Lower Old Red of Scotland: (1) a large thallus (natural size); (2) the folded lamina (x2); (3) spores ( X 150). After Don and Hickling (1917).
Cor...alline Alga Melobesia (Lithophyllum) lichenoides, Ag. of the Rhodophyceae (Fig. 21) and they conclude that the thallus grew probably attached to or on the surface of mud or sand.
With regard to the all-important question of affinity, Don and Hickling dissent entirely from the Dawsonian view that Parka was a sporocarp of "a somewhat generalised plant, shadowing forth the recent rhizocarps^." They regard it as a very low spore-bearing plant, belonging to a group which 1 Reid, Graham and Maenair (1897).
What to read after Devonian Floras; a Study of the Origin of Cormophyta?
You can find similar books in the "Read Also" column, or choose other free books by E a Newell Edward Alexander Newell Arber to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
20, 3) of which there is no evidence that they were formed in tetrads, or that they were heterosporous. These discs never overlap, though they coalesce occasionally. A grooved lamina (Fig. 20, 2) occurs on one side of the thaUus and is probably ventral.
In general habit Don and Hickling compare Parka with the Fig. 20. Parka decipiens, Flem., from the Lower Old Red of Scotland: (1) a large thallus (natural size); (2) the folded lamina (x2); (3) spores ( X 150). After Don and Hickling (1917).
Cor...alline Alga Melobesia (Lithophyllum) lichenoides, Ag. of the Rhodophyceae (Fig. 21) and they conclude that the thallus grew probably attached to or on the surface of mud or sand.
With regard to the all-important question of affinity, Don and Hickling dissent entirely from the Dawsonian view that Parka was a sporocarp of "a somewhat generalised plant, shadowing forth the recent rhizocarps^." They regard it as a very low spore-bearing plant, belonging to a group which 1 Reid, Graham and Maenair (1897).
What to read after Devonian Floras; a Study of the Origin of Cormophyta?
You can find similar books in the "Read Also" column, or choose other free books by E a Newell Edward Alexander Newell Arber to read onlineMoreLess
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